第三次作业

1

package com.example.myapplication;
import androidx.appcompat.app.AlertDialog;import androidx.appcompat.app.AppCompatActivity;
import android.content.DialogInterface;import android.os.Bundle;
public class MainActivity extends AppCompatActivity {

@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Overridepublic void onBackPressed(){
AlertDialog dialog;
AlertDialog.Builder builder=new AlertDialog.Builder(this)
.setTitle("普通对话框")
.setIcon(R.mipmap.ic_launcher)
.setMessage("是否退出应用:")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Overridepublic void onClick(DialogInterface dialog, int i) {
dialog.dismiss();
MainActivity.this.finish();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Overridepublic void onClick(DialogInterface dialog, int i) {
dialog.dismiss();
}
});
dialog=builder.create();
dialog.show();
}
}

　　

 

 

2

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="单选对话框"
        android:gravity="center"
        android:layout_marginTop="20dp"
        android:textSize="20sp"
        android:textColor="#474141"
        android:textStyle="bold"/>
    <Button
        android:id="@+id/bt_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="请选择你的性别"
        android:layout_marginTop="20dp"
        android:layout_gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        android:textColor="#474141"/>
</LinearLayout>package com.example.homework8;
import androidx.appcompat.app.AlertDialog;import androidx.appcompat.app.AppCompatActivity;
import android.content.DialogInterface;import android.os.Build;import android.os.Bundle;import android.view.View;import android.widget.TextView;import android.widget.Toast;
import java.util.Locale;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private TextView textView;
    final String [] sexs=new String[]{"男","女"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.bt_1).setOnClickListener(this);
        textView=(TextView) findViewById(R.id.tv_1);

    }
    public void onClick(View view){
        AlertDialog dialog;
        AlertDialog.Builder builder=new AlertDialog.Builder(this);
        builder.setTitle("请选择你的性别：");
        builder.setIcon(R.mipmap.ic_launcher);
        builder.setSingleChoiceItems(sexs, 1, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this,"您选择的是："+sexs[which],Toast.LENGTH_LONG).show();
                dialog.dismiss();
            }
        });
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this,"您选择了"+sexs[which],Toast.LENGTH_LONG).show();
                dialog.dismiss();
            }
        })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
        dialog=builder.create();
        dialog.show();
    }

　　

 

 

3

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="1.TextView显示的文本信息"
        android:textSize="25dp"
        android:layout_marginLeft="50dp"
        android:textColor="#8E8E8E"
        />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="50dp"
        android:layout_marginTop="10dp"
        android:layout_marginRight="50dp"
        android:textSize="25dp"
        android:text="2.按钮"
        android:textColor="#8E8E8E    " />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="3.编辑框:请输入信息"
        android:textSize="25dp"
        android:textColor="#8E8E8E    "
        android:layout_marginLeft="25dp"
        android:layout_marginTop="10dp"/>
    <RadioGroup
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dp"
        android:orientation="horizontal">
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="4.男"
            android:checked="true"
            android:textColor="#8E8E8E"
            android:textSize="25dp"></RadioButton>
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="女"
            android:textColor="#8E8E8E    "
            android:textSize="25dp"></RadioButton>

    </RadioGroup>
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="电脑"
        android:textSize="25dp"
        android:textColor="#8E8E8E    "
        android:checked="true"
        android:layout_marginLeft="20dp"
        />
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="手机"
        android:textSize="25dp"
        android:textColor="#8E8E8E    "
        android:checked="true"
        android:layout_marginLeft="20dp"
        />

</LinearLayout>

　　

 

 

4

package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;
public class Demo6Activity extends AppCompatActivity {

    private ListView mListView;
    private String[] titles={"桌子","苹果","蛋糕","线衣","猕猴桃","围巾"};
    private String[] prices={"1800元","10元/kg","300元","350元","10元/kg","280元"};
    private int[] icons={R.drawable.table,R.drawable.apple,R.drawable.cake,R.drawable.wireclothes,R.drawable.kiwifruit,R.drawable.scarf};
    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_demo6);
        mListView=(ListView) findViewById(R.id.lv);
        MyBaseAdapter mAdapter=new MyBaseAdapter();
        mListView.setAdapter(mAdapter);

    }
    class MyBaseAdapter extends BaseAdapter{
        public int getCount(){
            return titles.length;
        }
        public Object getItem(int position){
            return titles[position];

        }
        public long getItemId(int position){
            return position;
        }
        public View getView(int position, View convertView, ViewGroup parent){
            View view=View.inflate(Demo6Activity.this,R.layout.list_item,null);
            TextView title=view.findViewById(R.id.title);
            TextView price=view.findViewById(R.id.price);
            ImageView iv=view.findViewById(R.id.iv);
            title.setText(titles[position]);
            price.setText(prices[position]);
            iv.setBackgroundResource(icons[position]);
            return view;
        }
    }
}<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp">
    <ImageView
        android:id="@+id/iv"
        android:layout_width="120dp"
        android:layout_height="90dp"
        android:layout_centerVertical="true"/>
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_toRightOf="@id/iv"
        android:layout_centerVertical="true">
        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="桌子"
            android:textSize="20sp"
            android:textColor="#000000"/>
        <TextView
            android:id="@+id/tv_price"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="价格"
            android:textSize="20sp"
            android:textColor="#FF8F03"
            android:layout_marginTop="10dp"
            android:layout_below="@id/title"/>
        <TextView
            android:id="@+id/price"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="1000"
            android:textSize="20sp"
            android:textColor="#38EE74"
            android:layout_below="@id/title"
            android:layout_toRightOf="@id/tv_price"
            android:layout_marginTop="10dp"/>
    </RelativeLayout>

</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Demo6Activity"
    android:orientation="vertical">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="45dp"
        android:text="购物商城"
        android:textSize="18sp"
        android:textColor="#FFFFFF"
        android:background="#FF8F03"
        android:gravity="center"/>
    <ListView
        android:id="@+id/lv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>